3891278 has 16 divisors (see below), whose sum is σ = 6302880. Its totient is φ = 1796256.

The previous prime is 3891263. The next prime is 3891287. The reversal of 3891278 is 8721983.

3891278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125 + ... + 2792.

It is an arithmetic number, because the mean of its divisors is an integer number (393930).

Almost surely, 2^3891278 is an apocalyptic number.

3891278 is a deficient number, since it is larger than the sum of its proper divisors (2411602).

3891278 is a wasteful number, since it uses less digits than its factorization.

3891278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2971.

The product of its digits is 24192, while the sum is 38.

The square root of 3891278 is about 1972.6322515867. The cubic root of 3891278 is about 157.2886625471.

The spelling of 3891278 in words is "three million, eight hundred ninety-one thousand, two hundred seventy-eight".